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| Triple CRT Driver CORPORATION Preliminary Product Information CVA1404T FEATURES DESCRIPTION The CVA1404T contains three wideband amplifiers, designed specifically to drive a CRT. The device can drive monitors with resolutions up to 1024 x 768 (non-interlaced). The product is housed in the industry standard 11 lead TO-220 molded power package. ORDERING INFORMATION Part CVA1404T Package T11A Temperature -20oC to +100oC * * * * * Rise/Fall Time (at the Cathode) . . . . . . . . . . . . . . . . 9.0ns Swing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65VP-P Improved EMI Performance Pin to Pin Compatible to CVA2404T APPLICATIONS CRT driver for up to 64kHz monitors with resolution up to 1024 x 768 CONNECTION DIAGRAM VCC 6 11 10 9 8 7 6 5 4 3 2 1 GND VOUT 1 GND VCC VOUT 3 VIN 1 VBIAS VIN 2 VIN 3 GND VO 1,3,5 VBIAS VOUT 2 10 VIN 11,9,8 TOP VIEW T11A PACKAGE 1L-38 1T-18B 7,4,2,TAB CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CVA1404T CORPORATION ABSOLUTE MAXIMUM RATINGS Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100V Storage Temperature . . . . . . . . . . . . . . . . . . . -25oC to +125oC Operating Temperature . . . . . . . . . . . . . . . . . -20oC to +100oC Lead Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . +300oC DC ELECTRICAL CHARACTERISTICS Vs = 80V, DCINPUT BIAS = 12V, VIN = 2.5V, TCASE = +25oC. See Figure 1. SYMBOL Icc VOUT DC Av CHARACTERISTICS Supply Current @ 1MHz Output DC Level Voltage Gain Gain Matching 50 13 MIN TYP 15 54 15 0.2 MAX 18 58 17 UNITS mA V V dB AC ELECTRICAL CHARACTERISTICS (at the cathode) Vs = 80V, CL = 8pF, DCINPUT BIAS = 12V, VIN = 2.4V, VOUT = 50Vp-p. TCASE = +25oC. See Figure 1. SYMBOL Tr Tf Le OS Rise Time Fall Time Linearity Overshoot/Undershoot CHARACTERISTICS MIN TYP 8 8 5 3 MAX 9 9 UNITS ns ns % % FIGURE 1. TEST CIRCUIT VCC C3 6 C4 VBIAS C1 C2 D1 VOUT 1,3,5 L R1 R2 TEKTRONIX FET PROBE MODEL 6201 (CAP. 1.5pF) 10 CVA1404T VIN 7,4,2 C6 VIDEO 11,9,8 INPUT D2 GND,TAB C1 = 0.01mF C2 = 100mF C3 = 0.1mF C4 = 100mF C6 = 6.5pF D1, D2 = FHD400 L = 0.68mH R1 = 820W R2 = 47W 1U-40 CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CVA1404T CORPORATION FIGURE 2. +80V VBIAS L CVA1404T 919 R 479 VIDEO SPARK GAP 1U-41 FIGURE 3. +80V VBIAS CVA1404T VIDEO 1K L 479 R C CVA4501 DC BIAS I.C. BIAS V cc SPARK GAP 1U-42 APPLICATION INFORMATION The CVA1404T is a high voltage triple CRT driver suitiable to drive 69kHz, 1024 x 768 CRT displays. It features a high impedance input to match any pre-amplifier. The CVA1404T has a true class AB output stage that results in excellent gray scale linearity and consistent EMI performance. As with any high speed amplifier used in CRT display applications, specific precaution should be taken to get the required performance. Power supply should be by pass as close to the device pin as possible. Use 0.01f very near to the device and a large capacitor of 10f or more (preferable 100f) near the device. A 0.1f and 10f should be connected near the Vbias pin (#10). Arc protection is very essential. Fast diodes together with the spark gap will achieve sufficient protection. However, in certain applications depends on the tubes a high value of resistor is required to reduce the current into the CVA1404T during arcing. This will result in less than desireable performance some of which can be restored by using a peaking inductor at the output pin, Figure 2. Another way to achieve this is by using a RC network at the output of the device and use a peaking inductor at the tube, Figure 3. The rise and fall time of the CVA1404T may suffer due to stray capacitances associated with the PC Board and other components. It can be improved by carefully designing the PC Board where the output stage and input stage ground path are seperated. Calogic will assist customers in the layout of the PC Board that will result in quick EMI passage and better performance. The output peaking should be used only to restore the performance loss due to stray capacitances. Over peaking will cause excessive ringing that will have better results but poor EMI. The DC restore circuit is also important when considering the high frequency performance. Using CVA4502, DC Bias IC, better results can be obtained and high frequency performance can be maximixed. THERMAL CONSIDERATIONS Power supply current increases as the input signal increases and consequently power dissipation also increases. The CVA1404T cannot be used without heat sinking. The calculations below shows the power dissipated in each channel over the operating voltage range of the device. Under white screen conditions, i.e.: 25V output, dissipation increases to 8.1W total. The CVA1404T case temperature must be maintained below +100oC. If the maximum expected ambient temperature is +50oC, then a heat sink is needed with thermal resistance equal to or less than: Rth = (100 - 50oC) 8.1W = 6.2oC/W The output of CVA1404T is not short circuit proof. CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 CVA1404T CORPORATION FIGURE 4. APPLICATION CIRCUIT VCC C3 VBIAS C1 R3 10 C2 CVA1404T 6 D1 VOUT 1,3,5 C5 7,4,2 D2 DC BIAS C4 L VIN VIDEO 11,9,8 INPUT R4 R5 SPARK GAP GND,TAB R3 = 47W R4 = 47(1/2W)W R7 = 33W R8 = 39W R10 = 680W C1 = 0.01mF C2 = 100mF C3 = 0.1mF C4 = 100mF C5 = 2.2mF D1, D2 = FHD400 L = 330 - 390nH 1U-43 TYPICAL CHARACTERISTICS RISE TIME 8V 8V FALL TIME 1V/DIV -2V -55.6ns 20ns/DIV 144.4ns 1T-42 -2V -55.6ns 20ns/DIV 1V/DIV 144.4ns 1T-43 CROSS HATCH WHITE BACKGROUND 8V 8V CROSS HATCH BLACK BACKGROUND 1V/DIV -2V -21.6ns 20ns/DIV 1V/DIV 178.4ns 1T-45 -2V -55.6ns 20ns/DIV 144.4ns 1T-44 Information furnished by Calogic is believed to be accurate and reliable. However, no responsibility is assumed for its use: nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent rights of Calogic. CALOGIC CORPORATION, 237 Whitney Place, Fremont, California 94539, Telephone: 510-656-2900, FAX: 510-651-3025 |
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